TM 55-2210-224-122-24. GROUND RELAY ACTIONCAUTIONRepeated tripping of the ground relay, accompanied by unusual noises such as continuousthumping or squealing, may be an indication of serious traction motor trouble that must beinvestigated at once.a.If a ground occurs in the high-voltage circuit, theground relay will trip and the engine will return toidle, and the GROUND RELAY indicating light (1)will light.b.When the ground relay trips, correct the troubleas follows:(1)The ground relay may be energized bysome temporary condition. Reset byreturning throttle (2) to IDLE position andpressing GROUND RELAY RESETpushbutton (3). Normal operation may thenbe resumed.(2)If the ground persists, stop engine andreport this condition to your supervisor.2-25. RUNNING OVER RAILROAD CROSSOVERSWhen running over crossovers, move the throttle handle to reduce speed and avoid excessive jarring of gears andelectrical pitting of commutators.2-26. EMERGENCY APPLICATION OF BRAKESa.When the brakes apply automatically from thetrain at an emergency rate of reduction (indicatedby the brake pipe pressure falling rapidly to zero),place automatic brake valve handle (1) inEMERGENCY position to prevent the escape ofmain reservoir pressure, and leave it in thatposition until train stops. Move throttle handle (2)to IDLE position. Push sand control (3) until trainstops.b.Use independent brake valve (4) to reduce brakecylinder pressure on the locomotive to preventsliding the wheels. Then use the independentbrake heavily for the last 100 feet (30.48 m) toavoid a runout of slack as the train stops.2-38